James Gentle's Mathematical Ancestors

My thesis advisor for my PhD in Statistics in 1974 from Texas A&M University was H. O. Hartley.

The line of descent is shown below (each was a student of the prior one).
(You will notice from the pictures that the sequence is monotonically increasing in handsomeness.)

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Otto Mencken
Ph.D. Universität Leipzig , 1668

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Johann Christoph Wichmannshausen
Ph.D. Universitätt Leipzig, 1685

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Christian August Hausen
Dr. phil. Martin-Luther-Universität Halle-Wittenberg, 1713

Abraham Gotthelf Kaestner
Ph.D. Universität Leipzig, 1739

Johann Friedrich Pfaff
Dr. phil. Georg-August-Universität Göttingen, 1786

Carl Friedrich Gauß
Ph.D. Universität Helmstedt, 1799

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Christoph Gudermann
Ph.D. Georg-August-Universität Göttingen, 1841

Karl Theodor Wilhelm Weierstraß
(Honorary) Universität Königsberg, 1854

Georg Ferdinand Frobenius
Ph.D. Universität Berlin, 1870

Edmund Landau
Ph.D. Universität Berlin, 1899

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Adolf Hammerstein John Wishart
Dr. phil. Georg-August-Universität Göttingen 1919 Wishart studied under E.T. Whittaker, E.S. Pearson,
and R.A. Fisher, but did not take a Ph.D.

Herrmann Otto (Hirschfeld) Hartley
Ph.D., Mathematics, under A. Hammerstein, Universität Berlin 1934 (at age 22)
Ph.D., Statistics, under J. Wishart, Cambridge University, 1940
At Iowa State in the 50's At Texas A&M in the 70's
Courtesy of the Mathematics Genealogy Project.